介绍采用微波混频器的上变频特性实现宽带平方电路的设计方法与具体实现，主要用于高码速率QPS K信号的载波恢复。
An introduction of the design and implementation of a broad-band square circuit is given, which is used to recover the carrier of the high speed QPSK signal.
为全面实现以上原则通过理论分析指出采用偏差输入将优于采用绝对值输入； 采用时间常数可变的时限电路将优于采用平方电路。
It proves that it is superior to use the "deviation input" to the "absolute-value input" and better to use time circuit with variable time constant than to use square circuit.
宾夕法尼亚州匹兹堡的Akustica公司将MEMS麦克风与用于数字输出的电路配套放入一个不足5平方毫米的组件中。
Akustica, based in Pittsburgh, Pennsylvania, puts a MEMS microphone complete with the circuitry needed for digital output into a package less than 5mm square.
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